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Similar question can be raised for can_spin_on_owner() as well. Is it
worth for a contending ww_mutex to enter the osq queue if we expect a
EDEADLK? It seems to boil down to how likely is the EDEADLK going to
evaporate if we wait for the owner to finish and unlock.
The patch looks reasonable, just a question of desirability.
-Chris
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Chris Wilson, Intel Open Source Technology Centre